Rachel works at a bookstore. on tuesday, she sold twice as many books as she did on monday. on wednesday, she sold 6 fewer books than she did on tuesday. during the three days rachel sold 19 books. create an equation that can be used to find m, the number of books rachel sold on monday.

equation:a1 = a2

The answer is 5 books. a0 - number of book sold Monday a1 - number of books sold Tuesday a2 - number of books sold Wednesday On Tuesday sold twice than Monday -> a1 = 2a0 On Wednesday 6 fewer books than Tuesday -> a2=a1-6 during three days sold 19 books -> a0+a1+a2 = 19 a1=2a0; a2=a1-6;--> a2=2a0-6 a0+a1+a2 = 19--> a0+2a0+2a0-6 =19 that is 5a0-6=19 =>5a0=19+6 = 25 5a0=25==>a0=25/5 = 5 So the answer is 5 books